While Update 2.2 was the "major" jump, 2.21 is set to be the largest minor update in the game's history. Confirmed and highly likely features include:
The long-awaited multiplayer component that allows players to compete directly against one another. geometry dash 221 apk free
Specialized, time-limited levels with unique rewards. While Update 2
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A new exploration-based mode that will feature user-created levels across different themed areas, along with secrets, shops, and reward chests.